Articles made of multilayer composite material and preparation methods thereof

An article made of multilayer composite material, the multilayer composite material comprising central element (I) between first and second reinforcement layers (B) to form structure (B)-(I)-(B), the central element (I) consisting of:

• first structural layer (A), consisting of at least one first mat of first needle punched thermoplastic fibres selected from the group consisting of polyester fibres, polyamide fibres, polypropylene fibres, or mixtures thereof, the at least one first mat having a first face and a second face;
• second structural layer (A), consisting of at least one second mat of second needle punched thermoplastic fibres selected from the group consisting of polyester fibres, polyamide fibres, polypropylene fibres, or mixtures thereof, the at least one second mat having a third face and a fourth face;
• and
• third reinforcement layer (B) between the first structural layer (A) and the second structural layer (A);
• wherein the first, second, and third reinforcement layers (B) each consist of fibrous material, comprising one or more types of fibres selected from the group consisting of glass fibres, natural fibres, carbon fibres, basalt fibres, aramid fibres, or mixtures thereof,
• wherein the first structural layer (A) is bound to the first and third reinforcement layers (B) using only thermosetting resin on one or both of the first or second faces, and
• wherein the second structural layer (A) is bound to the second and third reinforcement layers (B) using only the thermosetting resin on one or both of the third or fourth faces.